Evaluate
\left(n-11\right)\left(n-10\right)
Expand
n^{2}-21n+110
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n^{2}-20n+100+10-n
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-10\right)^{2}.
n^{2}-20n+110-n
Add 100 and 10 to get 110.
n^{2}-21n+110
Combine -20n and -n to get -21n.
n^{2}-20n+100+10-n
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-10\right)^{2}.
n^{2}-20n+110-n
Add 100 and 10 to get 110.
n^{2}-21n+110
Combine -20n and -n to get -21n.
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